26th Oct, 2011 12:00
Maritime and Scientific Models, Instruments & Art (Implacable)
207
[M] A 19TH-CENTURY RUHMKORFF-TYPE INDUCTION...
A 19TH-CENTURY RUHMKORFF-TYPE INDUCTION COIL
unsigned, constructed in wood and lacquered brass with leather-covered coil cylinder and open ivory and brass wheel-type switch, mounted on mahogany base -- 13½ x 16in. (34.5 x 40.5cm.)
Named after Heinrich Ruhmkorff (1803-77) this is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current supply. To create the flux changes necessary to induce voltage in the secondary, the direct current in the primary is repeatedly interrupted by a vibrating mechanical contact called an interrupter. Developed at the beginning of 1836 by Nicholas Callan and others, the induction coil was the first type of transformer.
unsigned, constructed in wood and lacquered brass with leather-covered coil cylinder and open ivory and brass wheel-type switch, mounted on mahogany base -- 13½ x 16in. (34.5 x 40.5cm.)
Named after Heinrich Ruhmkorff (1803-77) this is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current supply. To create the flux changes necessary to induce voltage in the secondary, the direct current in the primary is repeatedly interrupted by a vibrating mechanical contact called an interrupter. Developed at the beginning of 1836 by Nicholas Callan and others, the induction coil was the first type of transformer.
Sold for £595
Estimated at £200 - £300
(inc. buyer's premium of 24%)
A 19TH-CENTURY RUHMKORFF-TYPE INDUCTION COIL
unsigned, constructed in wood and lacquered brass with leather-covered coil cylinder and open ivory and brass wheel-type switch, mounted on mahogany base -- 13½ x 16in. (34.5 x 40.5cm.)
Named after Heinrich Ruhmkorff (1803-77) this is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current supply. To create the flux changes necessary to induce voltage in the secondary, the direct current in the primary is repeatedly interrupted by a vibrating mechanical contact called an interrupter. Developed at the beginning of 1836 by Nicholas Callan and others, the induction coil was the first type of transformer.
unsigned, constructed in wood and lacquered brass with leather-covered coil cylinder and open ivory and brass wheel-type switch, mounted on mahogany base -- 13½ x 16in. (34.5 x 40.5cm.)
Named after Heinrich Ruhmkorff (1803-77) this is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current supply. To create the flux changes necessary to induce voltage in the secondary, the direct current in the primary is repeatedly interrupted by a vibrating mechanical contact called an interrupter. Developed at the beginning of 1836 by Nicholas Callan and others, the induction coil was the first type of transformer.
Auction: Maritime and Scientific Models, Instruments & Art (Implacable), 26th Oct, 2011
